yynerrs unused-but-set-variable warning with Clang 15

[nikic]

When building bison-generated parsers using Clang 15, a -Wunused-but-set-variable warning is thrown for the usually unused yynerrs variable:

/home/nikic/php/php-src-fast/Zend/zend_language_parser.c:4487:9: error: variable 'zendnerrs' set but not used [-Werror,-Wunused-but-set-variable]
    int yynerrs;
        ^
/home/nikic/php/php-src-fast/Zend/zend_language_parser.c:93:25: note: expanded from macro 'yynerrs'
#define yynerrs         zendnerrs

Probably the declaration needs to be annotated with YY_ATTRIBUTE_UNUSED.

[akimd]

Thanks for the report!

[cooljeanius]

Thanks for the report!

@akimd any plans to include closing commit a166d54 in a release anytime soon? See further discussion in #103